--- Csound5.13.0/Top/csmodule.c.orig	2011-04-07 11:00:11.880733934 +0100
+++ Csound5.13.0/Top/csmodule.c	2011-04-07 11:01:31.557737121 +0100
@@ -130,26 +130,25 @@
 static  const   char    *plugindir64_envvar = "OPCODEDIR64";
 
 /* default directory to load plugins from if environment variable is not set */
-#ifdef OLPC
-# define CS_DEFAULT_PLUGINDIR  "/usr/lib/csound/plugins"
-#else
 #if !(defined(_CSOUND_RELEASE_) && (defined(LINUX) || defined(__MACH__)))
 #  define ENABLE_OPCODEDIR_WARNINGS 1
-#  ifdef CS_DEFAULT_PLUGINDIR
-#    undef CS_DEFAULT_PLUGINDIR
+#  ifndef CS_DEFAULT_PLUGINDIR
+#    ifndef USE_DOUBLE
+#      define CS_DEFAULT_PLUGINDIR  "/usr/lib/csound/plugins"
+#    else
+#      define CS_DEFAULT_PLUGINDIR  "/usr/lib64/csound/plugins"
+#    endif
 #  endif
-#  define CS_DEFAULT_PLUGINDIR      "."
 #else
 #  define ENABLE_OPCODEDIR_WARNINGS 0
 #  ifndef CS_DEFAULT_PLUGINDIR
 #    ifndef USE_DOUBLE
-#      define CS_DEFAULT_PLUGINDIR  "/usr/local/lib/csound/plugins"
+#      define CS_DEFAULT_PLUGINDIR  "/usr/lib/csound/plugins"
 #    else
-#      define CS_DEFAULT_PLUGINDIR  "/usr/local/lib/csound/plugins64"
+#      define CS_DEFAULT_PLUGINDIR  "/usr/lib64/csound/plugins"
 #    endif
 #  endif
 #endif
-#endif
 
 typedef struct opcodeLibFunc_s {
     long    (*opcode_init)(CSOUND *, OENTRY **);  /* list of opcode entries  */